METHOD OF SYNTHESIS OF BENZENEHEXACARBOXYLIC (MELLITIC) ACID Russian patent published in 1997 - IPC

FIELD: chemical technology, organic chemistry. SUBSTANCE: invention relates to synthesis of benzenepolycarboxylic acids. Fibrous carbon substance is loaded in reactor fitted with water condenser. Fibrous carbon black is obtained by thermocatalytic decomposition of hexane-heptane fraction on nickel catalyst preliminary treated with nitric acid to remove nickel. Then alkaline solution of potassium manganese and silver nitrate is added in reactor. Reaction mixture is heated on sand bath at 100 C for 1 h. The obtained solution is decanted from a precipitate of unreacted carbon substance. Yellow crystals were precipitated at small evaporation. Crystals were filtered off on Buchner funnel and dissolved in ethanol. White needle-like crystals were precipitated after recrystallization, their m. p. is 288 C. The end product is used for production of epoxy resin hardening agents, corrosion inhibitors, azopigments and plasticizing agents for vinyl polymers. EFFECT: improved method of synthesis, decreased cost, increased yield and quality of the end product. 1 tbl